Costco, the warehouse chain known for its huge stores featuring supersized offerings of food and products in addition to lots of free food samples, is rolling out new delivery options in an effort to take on Amazon.

The company announced that it is rolling out two grocery delivery services that will bring fresh produce as well as packaged goods and other items, straight to customers’ doorsteps.

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The new programs include Costco Delivery, which offers two-day delivery on nonperishable foods and an extended partnership with Instacart, a service that offers same-day groceries.

In an earnings call Thursday, Richard Galanti, Costco’s executive vice president and chief financial officer, acknowledged that shopping habits were changing and that customers may not always feel the need to pick out their own fresh produce.

Costco said the goods sold for delivery will be priced higher than the same goods sold at its stores, but did not not specify how much higher, the Los Angeles Times reported.

The same-day delivery option, which is available in the Boston area but limited to specific areas, lets customers choose a one-hour window during which their order will arrive.

For orders of less than $35, there is a delivery fee.

Costco's same-day delivery website warns that prices on the goods will be about 15 percent to 17 percent higher than in stores. The website also says an additional 10 percent service fee will be added at checkout to cover the cost of the Instacart service.

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Costco ground beef sells for $2.99/lb at its stores in eastern Massachusetts. Shoppers who purchase it using their same-day service would pay $3.49/lb.

For example, Costco ground beef patties, which sell for $2.99 at its store in Dedham, Massachusetts, is priced at $3.49 for folks who wish to purchase it online and have it delivered to their door, not including the 10 percent delivery fee.

A four-pack of Kirkland Signature pizzas that sell for $9.99 inside Costco stores sells for $11.69 on its same-day delivery website.

The reach of the same-day delivery service is also highly limited for the time being.

For example, people who live in Needham and Wellesley can access the same-day delivery service, but people living in Natick, Framingham and Worcester cannot. Customers living in Milton can access the service, but it's not available to residents of Quincy.

Shares of Costco fell 6 percent on Friday after the retailer reported a decline in quarterly gross margins and underlined the growing competition in the industry.

Competition has further tightened since Amazon bought Whole Foods and reduced prices at the upmarket grocer in August, a move which has hit Walmart and Kroger hardest in terms of lost customers.

Galanti said Whole Foods’ price cuts had not impacted Costco and that it had not reduced its in-store prices in response to the deal.